Placing of subwoofers : Measurements of common setups with 2-4 subwoofers for an even sound pressure lever over the audience area and lower level on the stage

On live events like festivals and concerts subwoofers is a part of the main system, at smaller concerts it is not always a possibility to use a lot of subwoofers due to for example lack of space or not enough money. Sometimes it might only be possible to use 2 or 4 subwoofers. This essay shows a research were 8 different setups with 2-4 subwoofers were measured with Clio to see which setup to prefer when aiming for an even coverage in sound pressure level over the audience, at the same time that the level is lower on the stage. An even coverage is preferable so that there won’t be too large differences in the level of the lower frequencies depending on were one stand in the audience. Lower levels on the stage can make it easier for the musicians to hear themselves and avoid interference with the stage monitor system.The results of these measurements shows that the setups used had a quite similar level both on the stage and in the audience, the difference were just a few dB. To avoid comb filter and unevenness in levels the results show that setups with the subwoofers closer to each other are better.This work contains graphics with different colors for the different settings therefore it should be printed with color to be able to read it all.Validerat; 20130625 (global_studentproject_submitter